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Old 10-16-2012, 06:02 PM
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366 bbc vs 400 sbc

I was wondering which engine would be more powerful. I know the 400 has more displacement, but I've also heard that the 366 creates more power at lower rpms... I'm looking for maximum torque, which one would be better?
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Old 10-16-2012, 06:09 PM
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it depends on what you want. For a steet car, race car, or hot rod use the 400. The 366 was a halfway descent truck motor, but is a dog, not realy that powerful, and harder to get performance parts, (diferent than the other big blocks). I wouldn't use it cause it ain't really a practical car motor.
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Old 10-16-2012, 06:58 PM
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well I'm actually looking for an engine to put in an antique tractor for tractor pulling
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Old 10-16-2012, 07:02 PM
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Is there a reason your limited to these two choices?
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Old 10-16-2012, 07:10 PM
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In the same family as the 366,but the tall deck 427 long rod stroked is a torque monster.
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Old 10-16-2012, 10:28 PM
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Quote:
Originally Posted by Matty8 View Post
well I'm actually looking for an engine to put in an antique tractor for tractor pulling
The bore is too small on the 366. You need a ton of cubic inches and that motor ain't the one to start with.
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Old 10-16-2012, 10:54 PM
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If you are talking about a destroked BB to get 366 cubes then thats a tough question. The true limiting factors to maximum horse power is the amount of air that you can pass through the heads.A destroked bb can use monster bb heads. If you are talking about 10,000 rpm then the destroked BB will make more power.If you are talking about the 366 truck engine then I would use the 400 small block
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Old 10-16-2012, 11:01 PM
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think of what BB heads on a 4.4 bore with a short 3 inch stroke would make for power.thats the old 366 race engine,its actually closer to 365
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Old 10-17-2012, 12:59 AM
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The 366T was a raised deck motor (tall deck) that was used in schoolbuses and dumptrucks. It was the least powerful of the raised deck motors, had the smallest bore and awful heads. There was also a 427T and a 454T. Block deck height on a T deck was 10.200", whereas a standard deck BBC was 9.800".
You can use spacer plates on the heads to use a standard BBC intake manifold, but the fellows who have done it say they leak like a sieve.

Here's a thread I wrote after Dyno-Simming a 505 tall deck.....
Cheapo BBC 505 tall deck grunt motor

Last edited by techinspector1; 10-17-2012 at 01:07 AM.
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Old 10-17-2012, 12:49 PM
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Quote:
Originally Posted by Matty8 View Post
I was wondering which engine would be more powerful. I know the 400 has more displacement, but I've also heard that the 366 creates more power at lower rpms... I'm looking for maximum torque, which one would be better?
For tractor pulling the 400 will meet it's structural limits and fail sooner. The 366 is made from the git-go to work hard in big trucks and busses, the 400 was meant to move station wagons for less cost than a big block option.

Federal Mogul makes a .060 over piston which will give you 384 inch displacement engine, that's as far as it's practical to go size wise with this.

Bogie
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Old 10-17-2012, 01:40 PM
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I'm just looking at these two because they are sitting around at home doing nothing. I was already going to go with the 400 but someone else suggested the 366.
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Old 10-17-2012, 03:20 PM
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Bogie's probably right plus, if the 400 has never been bored it's worth some money, the 366 is worth about 12 cents a pound.
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Old 10-17-2012, 03:56 PM
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Bogie's probably right plus, if the 400 has never been bored it's worth some money, the 366 is worth about 12 cents a pound.
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Old 10-18-2012, 03:05 AM
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Another gent on this board years ago had a SBC on a tractor and wanted to know what he could do to kick up the torque so I laid out the combo to him.
Take your 400 and use the following pieces:
A Summit Racing camshaft with .210 duration and .440 lift part number SUM-1069
A set of small tube 1.5 inch primary headers.
A pair of 193 casting 350 TBI swirl port heads with steam holes drilled.
A dual plane intake.
A 2 barrel carb, a Rochester Dualjet perferred.
This combo will create stump pulling torque. The trick to it are the heads. The TBI swirl port heads swirl the incoming mixture at a very high velocity which creates neck snapping throttle response and monsterous torque.
The benefit here is they run out of breath around 4000 RPM due to the swirl port design simply can't flow enough to support higher RPMs and in this case is to your benefit as you would want to limit the engine to about 3000 to 3500 RPM, which is so low it wouldn't hurt the 400's bottom end.
Even so I'm not a gambling man I'd be willing to bet the 400 with the combo I just laid out would make just as much torque as the 366.
The benefits to this is big block like torque in a small block package and the small block is cheaper to maintain.

Last edited by DoubleVision; 10-18-2012 at 03:12 AM.
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Old 10-18-2012, 08:17 AM
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If this O/P wanted the best of both worlds I have to ref back to what I said about getting a tall deck 427 and have you re-read Tech's link. Of course a scratch build,but a cheap torque/hp monster right where he needs to be in the rpm range for a pulling tractor.
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